MKS INC
MKSI
55 insider filings · Latest: Sep 1, 2026
Common Stock Transactions
| Txn Date | Accepted | Insider | Type | Shares | Avg Price | Value | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|---|
| Feb 20, 2026 | Feb 20 4:06 PM | McCarthy Michelle M | Proposed Sale | 1,466 | $250.00 | $366.5K | — | View → |
| Feb 20, 2026 | Feb 20 4:03 PM | Burke Kathleen Flaherty | Proposed Sale | 4,254 | $250.00 | $1.1M | — | View → |
| Feb 20, 2026 | Feb 20 3:55 PM | Moloney Jacqueline F | Proposed Sale | 829 | $247.55 | $205.2K | — | View → |
| Dec 2, 2025 | Dec 2 3:05 PM | Mora Elizabeth | Proposed Sale | 300 | $158.81 | $47.6K | — | View → |
| Oct 22, 2025 | Oct 22 1:37 PM | Schreiner James Alan | Proposed Sale | 711 | $138.68 | $98.6K | — | View → |
| Oct 1, 2025 | Oct 1 1:48 PM | Moloney Jacqueline F | Proposed Sale | 300 | $122.14 | $36.6K | — | View → |
| Sep 18, 2025 | Sep 18 4:54 PM | Henry David Philip | Proposed Sale | 5,000 | $130.00 | $650.0K | — | View → |
| Sep 18, 2025 | Sep 18 2:02 PM | Schreiner James Alan | Proposed Sale | 838 | $124.00 | $103.9K | — | View → |
| Sep 2, 2025 | Sep 2 4:10 PM | Mora Elizabeth | Proposed Sale | 300 | $99.85 | $30.0K | — | View → |
| Aug 1, 2025 | Aug 1 2:56 PM | Moloney Jacqueline F | Proposed Sale | 300 | $92.10 | $27.6K | — | View → |
| Jul 7, 2025 | Jul 7 5:31 PM | Schreiner James Alan | Proposed Sale | 957 | $102.44 | $98.0K | — | View → |
| Jul 3, 2025 | Jul 3 2:32 PM | Henry David Philip | Proposed Sale | 2,000 | $105.00 | $210.0K | — | View → |
| Jun 2, 2025 | Jun 2 3:19 PM | Mora Elizabeth | Proposed Sale | 300 | $81.78 | $24.5K | — | View → |
| Mar 3, 2025 | Mar 3 3:25 PM | Moloney Jacqueline F | Proposed Sale | 300 | $92.46 | $27.7K | — | View → |
| Mar 3, 2025 | Mar 3 3:07 PM | Mora Elizabeth | Proposed Sale | 275 | $92.46 | $25.4K | — | View → |
| Feb 18, 2025 | Feb 18 6:59 PM | COLELLA GERARD G | Proposed Sale | 8,000 | $104.53 | $836.2K | — | View → |
| Dec 10, 2024 | Dec 10 4:56 PM | Moloney Jacqueline F | Proposed Sale | 300 | $114.80 | $34.4K | — | View → |
| Dec 2, 2024 | Dec 2 3:58 PM | Mora Elizabeth | Proposed Sale | 275 | $113.41 | $31.2K | — | View → |
| Oct 1, 2024 | Oct 1 3:44 PM | Moloney Jacqueline F | Proposed Sale | 250 | $108.90 | $27.2K | — | View → |
| Sep 3, 2024 | Sep 3 1:47 PM | Mora Elizabeth | Proposed Sale | 275 | $115.97 | $31.9K | — | View → |
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Stock Options & Derivatives
| Txn Date | Accepted | Insider | Type | Shares | Exercise Price | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|
| Aug 17, 2026 | Aug 18 6:07 PM | Renee Martel DonlanEVP, GC & CCO | Grant/Award | 954.044 | — | 4,780.571(D) | View → |
| Apr 17, 2026 | Apr 20 3:31 PM | John Edward WilliamsEVP & GM, PSD | Option Exercise | 1,740.714 | — | 6,812.003(D) | View → |
| Apr 15, 2026 | Apr 16 7:29 PM | Michelle M MccarthySVP & Chief Accounting Officer | Grant/Award | 1,672.862 | — | 11,199.16(D) | View → |
| Apr 15, 2026 | Apr 16 7:29 PM | Michelle M MccarthySVP & Chief Accounting Officer | Option Exercise | 3,811 | — | 7,388.16(D) | View → |
| Feb 17, 2026 | Feb 18 10:07 PM | Eric Robert TarantoEVP & GM, VSD | Grant/Award | 1,758.956 | — | 14,501.557(D) | View → |
| Feb 17, 2026 | Feb 18 10:07 PM | Eric Robert TarantoEVP & GM, VSD | Option Exercise | 6,472.891 | — | 8,028.666(D) | View → |
| Feb 17, 2026 | Feb 18 10:05 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Option Exercise | 9,281.817 | — | 12,093.416(D) | View → |
| Feb 17, 2026 | Feb 18 10:05 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Grant/Award | 2,567.126 | — | 21,375.233(D) | View → |
| Feb 17, 2026 | Feb 18 10:02 PM | James Alan SchreinerEVP & COO | Option Exercise | 9,225.392 | — | 11,396.475(D) | View → |
| Feb 17, 2026 | Feb 18 10:02 PM | James Alan SchreinerEVP & COO | Grant/Award | 2,376.968 | — | 20,621.867(D) | View → |
| Feb 17, 2026 | Feb 18 10:00 PM | John Edward WilliamsEVP & GM, PSD | Option Exercise | 3,238.11 | — | 8,552.717(D) | View → |
| Feb 17, 2026 | Feb 18 10:00 PM | John Edward WilliamsEVP & GM, PSD | Grant/Award | 1,473.72 | — | 11,790.827(D) | View → |
| Feb 17, 2026 | Feb 18 9:58 PM | Ramakumar MayampurathEVP & CFO | Option Exercise | 5,660.08 | — | 23,898.453(D) | View → |
| Feb 17, 2026 | Feb 18 9:58 PM | Ramakumar MayampurathEVP & CFO | Grant/Award | 4,278.543 | — | 29,558.533(D) | View → |
| Feb 17, 2026 | Feb 18 9:55 PM | Kathleen Flaherty BurkeEVP, GC & Secretary | Grant/Award | 3,327.755 | — | 27,335.12(D) | View → |
| Feb 17, 2026 | Feb 18 9:55 PM | Kathleen Flaherty BurkeEVP, GC & Secretary | Option Exercise | 12,206.134 | — | 15,128.986(D) | View → |
| Feb 17, 2026 | Feb 18 9:52 PM | John Tseng-Chung LeeDirector, President & CEO | Option Exercise | 69,889.252 | — | 84,828.121(D) | View → |
| Feb 17, 2026 | Feb 18 9:52 PM | John Tseng-Chung LeeDirector, President & CEO | Grant/Award | 15,592.911 | — | 154,717.373(D) | View → |
| Feb 8, 2026 | Feb 9 7:08 PM | Eric Robert TarantoEVP & GM, VSD | Grant/Award | 3,504.314 | — | 12,742.601(D) | View → |
| Feb 8, 2026 | Feb 9 7:06 PM | David Philip HenryEVP, Global Str Mktg & GM, MSD | Grant/Award | 5,521.949 | — | 18,808.107(D) | View → |
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